Build and test failures with Qt 5.6 and Qt 5.3

[Jan Kundrát]

Hi folks,
please take a look at the CI status matrix at [1]. TL;DR: There are build 
failures with Qt 5.3, plenty of test failures, and some test failures 
specific to the still unreleased Qt 5.6.

Oh, and a cmake 3.4-git regression that I'm not going to bother you with. 
Reported, known, downgraded for now.

This testing is more or less a side effect of kio's and plasma-workspace 
presence in Gerrit. If you like this CI coverage, if you appreciate the 
range of covered compilers and Qt5 versions, or if you would like it to 
extend the coverage to all of KF5 and/or plasma or some other apps, please 
let me know.

A quick summary (please click the "console" link in the matrix overview to 
see full log):

- [5.3] kactivities: won't build due to QQuickWidget::setClearColor which 
is 5.4+ only.

- [5.3] kcoreaddons: QDebug::noquote

- [5.3] kwidgetsaddons: QTimer::singleShot and the new slot syntax

- [5.3] plasma-workspace: QString::splitRef

- [5.6] karchive: wrong number of items in the archive

- [5.6] kconfig: error which I don't understand

- [5.6] kcoreaddons: different number formatting

- kio, in all versions: test failures in KNewFileMenuTest::test(text file 
with jpeg extension)

- kservice, in all versions: test failure

- [5.6] kwindowsystem: KWindowInfoX11Test fails tests

- plasma-framework, all versions: wrong dialog dimensions/offsets

[1] http://ci-logs.kde.flaska.net/matrix.html

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